Merge branch 'docs-broken-links' into 'master'

Docs broken links

See merge request gitlab-org/gitlab-ce!20098

doc/administration/job_traces.md

@@ -134,4 +134,4 @@ We're currently evaluating this feature on dev.gitalb.org or staging.gitlab.com
 
 - TBD
 
-[ce-44935]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18169
+[ce-18169]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18169
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doc/user/admin_area/settings/sign_up_restrictions.md

@@ -38,3 +38,4 @@ semicolon, comma, or a new line.
 ![Domain Blacklist](img/domain_blacklist.png)
 
 [ce-5259]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5259
+[ce-598]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/598

doc/user/project/issues/deleting_issues.md

@@ -9,3 +9,5 @@ You can delete an issue by editing it and clicking on the delete button.
 ![delete issue - button](img/delete_issue.png)
 
 >**Note:** Only [project owners](../../permissions.md) can delete issues.
+
+[ce-2982]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2982
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